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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Share-based Compensation [Abstract] |
Fair Value Assumptions for Performance Awards | The fair values of the senior executives' performance share award grants with a TSR modifier for grants in 2018 and 2017 were $61.59 and $64.82, respectively, which were estimated using the Monte Carlo valuation model, and incorporated the following assumptions:
| 2018 |  | 2017
Risk-free interest rate | 2.4 | % |  | 1.5 | %
Dividend yield | 1.3 | % |  | 1.1 | %
Volatility factor | 38.9 | % |  | 38.3 | %
Expected life of award | 2.9 years |  |  | 2.9 years |

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- Definition Schedule of Share-based Payment Award, Equity Instruments Other than Options, Valuation Assumptions [Table Text Block] + References No definition available. + Details
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